This is an odd one from YouTube. The poster said this:-
"This video is guaranteed NOT to cause hay fever. If you don't own your own lawn, now you can pretend you do, with "12 HOURS OF A LAWNMOWER SOUND EFFECT". The ultimate sound effect for astounding your fellow apartment dwellers!!!"
[video][/video] Source:
Ah ... the serenity... And I don't have hay fever - it's a miracle!